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[3.11] gh-109592: test_eintr tolerates 20 ms when comparing timings (GH-110102) (#110107)

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gh-109592: test_eintr tolerates 20 ms when comparing timings (GH-110102)
(cherry picked from commit 9c73a9acec)

Co-authored-by: Victor Stinner <vstinner@python.org>
This commit is contained in:
Miss Islington (bot) 2023-09-29 06:47:24 -07:00 • committed by GitHub
parent 4b97c724e0
commit b07661d889
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1 changed files with 16 additions and 7 deletions
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23
Lib/test/_test_eintr.py
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@ -25,6 +25,12 @@ from test import support
from test.support import os_helper
from test.support import socket_helper
# gh-109592: Tolerate a difference of 20 ms when comparing timings
# (clock resolution)
CLOCK_RES = 0.020
@contextlib.contextmanager
def kill_on_error(proc):
"""Context manager killing the subprocess if a Python exception is raised."""
@ -75,6 +81,9 @@ class EINTRBaseTest(unittest.TestCase):
cmd_args = (sys.executable, '-c') + args
return subprocess.Popen(cmd_args, **kw)
def check_elapsed_time(self, elapsed):
self.assertGreaterEqual(elapsed, self.sleep_time - CLOCK_RES)
@unittest.skipUnless(hasattr(signal, "setitimer"), "requires setitimer()")
class OSEINTRTest(EINTRBaseTest):
@ -373,7 +382,7 @@ class TimeEINTRTest(EINTRBaseTest):
time.sleep(self.sleep_time)
self.stop_alarm()
dt = time.monotonic() - t0
self.assertGreaterEqual(dt, self.sleep_time)
self.check_elapsed_time(dt)
@unittest.skipUnless(hasattr(signal, "setitimer"), "requires setitimer()")
@ -437,7 +446,7 @@ class SelectEINTRTest(EINTRBaseTest):
select.select([], [], [], self.sleep_time)
dt = time.monotonic() - t0
self.stop_alarm()
self.assertGreaterEqual(dt, self.sleep_time)
self.check_elapsed_time(dt)
@unittest.skipIf(sys.platform == "darwin",
"poll may fail on macOS; see issue #28087")
@ -449,7 +458,7 @@ class SelectEINTRTest(EINTRBaseTest):
poller.poll(self.sleep_time * 1e3)
dt = time.monotonic() - t0
self.stop_alarm()
self.assertGreaterEqual(dt, self.sleep_time)
self.check_elapsed_time(dt)
@unittest.skipUnless(hasattr(select, 'epoll'), 'need select.epoll')
def test_epoll(self):
@ -460,7 +469,7 @@ class SelectEINTRTest(EINTRBaseTest):
poller.poll(self.sleep_time)
dt = time.monotonic() - t0
self.stop_alarm()
self.assertGreaterEqual(dt, self.sleep_time)
self.check_elapsed_time(dt)
@unittest.skipUnless(hasattr(select, 'kqueue'), 'need select.kqueue')
def test_kqueue(self):
@ -471,7 +480,7 @@ class SelectEINTRTest(EINTRBaseTest):
kqueue.control(None, 1, self.sleep_time)
dt = time.monotonic() - t0
self.stop_alarm()
self.assertGreaterEqual(dt, self.sleep_time)
self.check_elapsed_time(dt)
@unittest.skipUnless(hasattr(select, 'devpoll'), 'need select.devpoll')
def test_devpoll(self):
@ -482,7 +491,7 @@ class SelectEINTRTest(EINTRBaseTest):
poller.poll(self.sleep_time * 1e3)
dt = time.monotonic() - t0
self.stop_alarm()
self.assertGreaterEqual(dt, self.sleep_time)
self.check_elapsed_time(dt)
class FNTLEINTRTest(EINTRBaseTest):
@ -512,8 +521,8 @@ class FNTLEINTRTest(EINTRBaseTest):
# potential context switch delay
lock_func(f, fcntl.LOCK_EX)
dt = time.monotonic() - start_time
self.assertGreaterEqual(dt, self.sleep_time)
self.stop_alarm()
self.check_elapsed_time(dt)
proc.wait()
# Issue 35633: See https://bugs.python.org/issue35633#msg333662